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The penny was as old English term used to describe the number of pennies required to purchase 100 nails. Today the term is used only as a measurement of the length of the nail. A common 16 penny nail used in general construction today has a standard length of 3.5 inches, a number 8 gauge diameter shaft (0.162 inches), a head diameter of 11/32nd of an inch and 44 such nails will weigh one pound.
For wire gauge, 1.25 mm diameter wire is closest to 16 gauge (AWG). See related link.
If 10 diameter means 10 ft diameter then the area is 78.54 sq.ft.
If a circle's diameter is 10, the circumference is: 31.416
diameter = 10/pi inches